feat(amm): Introduce getPoolUsingMarketId public view accessor with Natspec documentation

[Neros0]

Description

This PR adds a dedicated view section and a new external read-only helper function to the TestAMMContract, improving on-chain data accessibility for clients, indexers, and off-chain bots.

---

✅ Key Additions

🧭 View Function Section Header

A clearly defined section separator was added to distinguish read-only functions from core logic:

//////////////////////////////////////////////////////////////
//                      VIEW FUNCTIONS                     //
//////////////////////////////////////////////////////////////